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OpenStudy (anonymous):
Quadrilateral Proof - Help Please
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OpenStudy (anonymous):
OpenStudy (phi):
Do you know about congruent triangles? If two triangles are congruent then their corresponding sides and angles are congruent (= to each other). Do you know about SAS? If a triangle has a side-angle-side congruent to another, they are congruent.
OpenStudy (phi):
A square has equal sides and equal angles, so the two triangles formed by the diagonal and sides are congruent.
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